Improved heating stove or furnace



A. ERNST.

Heating Stove.

Patented Sept. 20-, 1864.

N, PETERS. Pnula-umo lmn Washington. D. c.

UNITED STATES PATENT OFFICE.

- ADAM ERNST, ()F MILWVAUK EE, VVISOONSIN.

IMPROVED HEATING STOVE 0a FURNACE.

Specification forming part of Letters Patent No. 44,295, dated September 20, 1864.

T0 aZZ whom it may concern.-

Be it known that I, ADAM ERNST, of the city and county of Milwaukee, and State of Wisconsin, have invented certain new and useful Improvements in Furnaces for Heating Purposes; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being bad to the accompanying drawings, in which-:-

Figure 1 represents a vertical central section through said furnace. Fig. 2 represents a horizontal section through the same in the line to 00. Fig. 3 represents a horizontal section through the same in the line y 2. Fig. 4

represents a perspective view of the grate of my furnace. I

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A represents the firepot of my furnace. It is made of a number of iron or metal pipes or flues,'a, which are secured within the furnace in acircularor other order. These flues may be set with their sides in close contact with each other, or a space, m, may be left between each two adjoining pipes to permit air to enter the fire-pot at its sides also, as shown in Figs. 1 and 2; but when such a space is left between adjoining pipes it does not extend through their entire length, but only through the lower portion thereof, as shown in Fig. 1.

B represents the ash-pit, and O the ash-pan. The former is surrounded by the air-chamber D, which is supplied with cold air from the floor of the room through the holes I) in the the bottom of the furnace.

E represents the outer air-chamber, through which the cold air enters, which is to pass through the spaces m into the fire-pot. It is provided with registers a, by which the amount of air can be regulated, the air passing through the passages d and f into the space F, and thence between the pipes a into the fire-pot.

The outer shell, G, of the furnace may be provided with isinglass windows, through which the glow of the fire can be seen, and the heat from said shell radiates into the room, while the cold air which has entered the pipes at at it becomes heated in passing upward and escapes through the perforated rim H into the room. When the pipes a are set close together, the outer shell, G, may be perforated, or

may be made of grated casting, so that the heat from the flues a may be radiated directly into the room. One of the air-pipes, a, is extended above, for the purpose of supplying the upper part of the furnace with air to keep up the circulation therein, and also to fully consume the gases of combustion. The latter is effected by means of a jet of air which passes through the passage g into the gas ring it,

whence it escapes through the holes '6 on the inner circumference of said ring, and being brought in contact in jets with the gases escapin g from the fire-pot A, said gases are burned by the additional supply of hot air.

The upper part of the furnace consists of a cylinder, I, within which adrum, K, is secured. Between these two I arrange helical fiues is, through which the smoke and heated gases pass, and which in their circuitous passage expend their heat, which is radiated from the cylinder I. They at the same time heat the drum K, and the smoke finally escapes through the pipe L. The pipe M is secured in the center of the drum K. [t is open at its lower end, while its upper elbow-shaped end communicates with the helical flues 70. Part of the smoke and gases passes through the pipe M, and thus the drum K is heated from the outside by means of the helical flues 7c and from the inside by means of the pipe M, the latter being provided with a damper, o, by which the heat is regulated. The pipe N, which is an extension of one of the air-pipes a, communicates with the drum K, and discharges the air which it receives from below into said drum, whereit is still more heated in passing through it, and it finally escapes through the perforated cover 0 into the upper room, to beheated.

The grate of this furnace is composed of two concentric rings. The outer ring, 0, rests on the pivots p, and can swing thereon. Itis supported in its horizontal position by the fixed bar q and by the inner end of the movable rod 1'. Theinnerringor plate, P, is supported by the ends 1 of the stirrup s, and also by the inner ends of the pivots 10. It can be turned horizontally on its Vertical shaft 15 by means of the vertical arm a, whose lower end extends downward, so that it can be reached through the aperture of the ash-pan G. The grate can thus be cleared of ashes by turningit horizontally. It can also be turned vertically to clean th; furnace by withdrawing the rod r.

The operation of the furnace is as follows: The fuel is introduced through the door Q, and the cold air enters the fire-box A-through the ash-pit B, the grate, and passages m between the pipes to. The smoke and gases of combustion pass up through the central pipe, M, and through the helical flues 7c, and escape through the pipe L, and in their passage they heat the drum K and cylinder I, which latter radiates the heat into the upper room. The cold air enters the furnace through the holes I) in the.

air-chamber D, passes through the flues a, thence through the perforated rim E into the room to be heated. The pipe N, which is the extension of one of the pipes to, supplies the gas-ring h with air, and also the drum K, where the'air, in passing through the drum,is intensely heated, and escapes upward through the cover 0. On the drawings the currents of air are shown in blue arrows and the currents of smoke and heated'gases in red arrows.

The air introduced into this furnace for heating as well as to keep up the-combustion is taken from near the floor of the room, and a current of air is consequently created in the room, which causes the heated air from the ceiling to descend in order to fill the vacuum created by the absorption of the cold air near the floor.

Having thus fully described the nature of my invention, what I claim herein as new, and desire to secure by Letters Patent, is-

1. In combination with the pipes at, which constitute the fire-pot of the furnace, the cold- ADAM ERNST.

Witnesses:

PETER H. MAYER, H. KoEs'rLER. 

